60-docker

#!/bin/bash
# This script lists all docker containers and their status
# Taken from https://github.com/yboetz/motd/blob/master/60-docker

# set column width
COLUMNS=2
# colors
green="\e[1;32m"
red="\e[1;31m"
undim="\e[0m"

mapfile -t containers < <(docker ps -a --format '{{.Names}}\t{{.Status}}' | awk '{ print $1,$2 }')

out=""
for i in "${!containers[@]}"; do
    IFS=" " read -r name status <<< "${containers[i]}"
    # color green if service is active, else red
    if [[ "${status}" == "Up" ]]; then
        out+="${name}:,${green}${status,,}${undim},"
    else
        out+="${name}:,${red}${status,,}${undim},"
    fi
    # insert \n every $COLUMNS column
    if [ $(((i+1) % COLUMNS)) -eq 0 ]; then
        out+="\n"
    fi
done
out+="\n\n"

printf "\ndocker status:\n"
printf "$out" | column -ts $',' | sed -e 's/^/  /'